NO-JIRA: [Python] IO: Add ENETUNREACH to the list of tolerated errors

...which will enable reconnection logic to act in this case.
ENETUNREACH can happen when target network is unreachable for example
when the network stack was not fully initialized yet or when a network
is not connected temporarily, etc.
This makes ENETUNREACH handled just like EHOSTUNREACH
(which is for some reason indicated with EINPROGRESS in this part of the code).

Signed-off-by: Ievgen Popovych <ievgenp@seetrue.ai>

python/proton/_io.py

@@ -65,7 +65,7 @@ def connect(addr) -> socket.socket:
         try:
             s.connect(addr[4])
         except socket.error as e:
-            if e.errno not in (errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EAGAIN):
+            if e.errno not in (errno.EINPROGRESS, errno.EWOULDBLOCK, errno.EAGAIN, errno.ENETUNREACH):
                 raise
         return s